Threadless labrets use a push-in pin held by tension; internally threaded labrets use a decorative end with a small screw stem that enters the post. Both can have a flat backing. “Flat back” describes the backing shape, not how the front attaches.
How each connection works
In a threadless system, the decorative end's pin enters a compatible hollow post. Retention commonly relies on a slight bend in the pin, adjusted according to the maker's instructions. The pin itself does not screw into place. This is why an end that looks straight or loose is not something to reshape blindly while it is in a piercing.
In an internally threaded system, threads are inside the receiving post and the removable end carries the small threaded stem. In an externally threaded system, the screw threads are on the outside of the post. That third design is mechanically different and needs a different replacement end.
What makes one easier to live with?
Threadless jewelry avoids turning a tiny screw for every end change, but removing and seating a small push-in end can still be awkward. Internally threaded jewelry offers a screw connection, but the parts must align correctly; cross-threading or forcing an end can damage them. Neither design removes the need to inspect security and follow the maker's instructions.
For a placement that is hard to reach, professional changes may be simpler than choosing a system solely because someone else finds it easy. A qualified piercer can demonstrate handling on the actual jewelry.
Compatibility is the key buying question
A 16G label describes shaft thickness, not every dimension of the connection. Thread diameter and pitch can vary between threaded systems. Threadless parts also need confirmed pin-and-post compatibility. Do not assume an attractive end from another brand will fit an existing post.
For a replacement, collect the original product name, manufacturer or series if available, gauge and connection. Ask: “Does this exact end fit this exact post?” That is a more useful question than asking whether both are called labrets.
Separate connection from fit
Once the mechanism is clear, check wearable post length, gauge, backing diameter and top size. Changing a 3mm gem to a 2mm gem does not automatically shorten the post. Changing from a threaded to a threadless complete stud does not prove the new post is the right length.
The APP's initial-jewelry guidance discusses smooth wearable surfaces and internally threaded or threadless construction. Material specification, polish and individual fit still matter alongside the connection.
Before checkout
- Confirm whether the listing sells a complete stud, post only or top only.
- Match your confirmed gauge and wearable length.
- Check top dimensions and the space around the placement.
- Verify compatibility if keeping any existing component.
Can a threadless end screw into an internally threaded post?
No. They are different mechanisms. If a part resists, stop and identify the system instead of forcing it. Keep spare ends labeled with the compatible post.
Continue reading: Replacement Body Jewelry Ends: Compatibility Guide.
Feature image: AI-generated editorial illustration, not an exact product photograph or a size reference. Product listings show the actual designs and specifications.
Shop related jewelry at Kruelty
Use your confirmed measurements to compare these specific designs. Check the current product options, materials and package contents; the examples are not a universal size recommendation.
- Titanium Labret Stud 20 18 & 16 Gauge Threadless Ring Clear Gem — Compare the separately listed gauge, 6mm or 8mm post length, and 2mm or 3mm gem options.
- Titanium Labret Stud 20 18 & 16 Gauge Threadless Flat Back Ring — A complete threadless ball-top option; check the selected color's finish as well as its fitted dimensions.